Abrading machine



I5 Sheets-Sheet l INVENTUR July 18, 1933. H. L. CHAPIN ABRADING IACBINE Filed Feb. 11, 1929 3 Sheets-Sheet 2 July 18, 1933. H. 1.. CHAPIN ABRADING MACHINE 3 Sheets-Sheet 3 Filed Feb. 11

VENTUR Patented July 18, 1933 UNITED STATES PATENT OFFICE HERBERT L. CHAPIN', OF SWAMP'SCOTT, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY ABRADING MACHINE Application filed February 11, 1929. Serial No. 339,179.

This invention relates to abrading machines and is herein illustrated as embodied in a machine for scouring the heels of boots and shoes. In machines of this class the edge of the heel of a shoe is presented to the periphery of a scouring wheel, and as the material of the heel is thus abraded, dust is driven off in a direction approximately tangential to the wheel. It has been customary to provide a conduit in communication with a suction draft system to receive and carry away some of the dust thus given off by the work. The fact that the toe portion of the shoe extends in the direction of the dust stream given off by the work in certain positions thereof presents a serious difliculty in the design of the receiving end of such a conduit, and has prevented hitherto the design of a receiving end which not only gathers in all of the dust but also permits the fullest degree of manipulation of the shoe without interference with the toe portion thereof.

One of the objects of this invention is to provide a dust receiving member which will be free from the difficulty above de scribed. In accordance with this object a portion of the illustrated dust collecting member is in the form of a funnel having a large open end adjacent to the periphery of a scouring wheel to receive dust given off from the work, another portion of the dust collecting member being, as illustrated, in the form of an open-bottomed V-shaped trough lying in the plane of the scouring Wheel to receive additional dust and opening at one end into the funnel. The other end of the illustrated trough is closed and at a lower level, and the remaining portion of the dust collectin member shown in the drawings is in the Form of a conduit providing communication between the intake of a suction draft system on the one hand and the small end of the funnel and the bottom of the trough on the other hand. The illustrated dust collecting member, by reason of its shape as above described, is enabled not only to gather substantially all of the dust given off by the work but also to distribute the intensity of the draft passing through it in such a manner as to avoid I deposits of entrained dust, while at the Same time the dust collecting member is enabled to avoid interference with the shoe, and particularly with the toe end of the shoe, as the edge of the heel of the shoe is presented to the scouring wheel.

These and other features of the invention will be described as embodied in an illustrative machine and pointed out in the appended claims.

Referring now to the accompanying drawings,

Fig. 1 is a front elevational view of a machine which embodies the invention;

Fig. 2 is a side elevational view of the machine shown in Fig. 1;

Fig. 3 is a sectional View taken line IIIIII of Fig. 1;

Fig. 4 is an enlarged fragmentary view of a shaft and a bearing of the machlne;

Fig. 5 is a sectional view taken on the line V-V of Fig. 6; and

Fig. 6 is a sectional view taken on the line VIVI of Fig. 2 showing the form of a dust receiving member of the machine.

Upon a frame or standard 10 (Figs. 1 and 2) is mounted a housing 12 which carries all of the operative instrumentalities of the machine. A shaft 16 journalled in on the the housing 12 extends transversely of the 1 standard 10 and carries at each end a scouring wheel 18. A spiral gear 20 is keyed upon the shaft 16 at the center thereof, and meshing with the gear 20 is a second spiral gear 22 keyed upon the forward endof a rearwardly extending drive shaft 24 which is journalled in a bearing block 26 (Fig. 3) fitted within the housing 12 and'retained therein by a set screw 25. The housing 12 encloses the gears 20 and 22 andthus constitutes a gear casing. A circular opening is provided in the front wall of the housing 12 to permit access to the bearing-block 26 and the gear 22 for removing or replacing these members, and this opening is closed by a circular cover 27 (Fig. 2) which is threaded into the housing 12 and'which is provided with a pair of aligned slotted lugs 29 into which a tool may be inserted for turning the cover 2?. I lugs 29 conceals the ot machine is shown w' s Upon the rear end oi: the slzai't 2 1- is mounted a coupling member 28 through which motor 30 drives'the shaft 2 1V cover 14 secured to the housing; 12 the coupling 28. The motor 3-0 bo upon a table 32 (Fig. 2) whic has 1: in portion 34 vertically adjustable :d ester? sion 36 of the hous ng 22. Mn adjusting screw 38 is threaded in the liable 32 anii bears againstthe extension 36, therebvdetermining the height of the table 32. A. set

screw 40 threaded in the extension 36 bears against the stem 34- and thus holds the table 32 in adjusted position. A switch 42 mounted upon the front of the standard 1- controls the rotation of the scouring wheels 18 I ing levels of the shaft 24 a seres of bearing blocks 26 are provided, all of which bearing" blocks have the same external dimensions '50 as to fit Within the housing; 12-,hnt having bores at varying levels for the shaft 24. In the illustrated machine each of the blocks 26 is cylindrical, and is provided with a key- Way 44 which cooperates Wit-l1.a "i.4.6 secured in the housing 12 to deter-mi the no sition of the bloclt 26 before securing the P latter by the set screw 25 and thus to center the shaft 24. As the shaft 242 is'r ised or lowered by substituting thevarioiis blocks 26, the motor 30 may be raised or lowered into alignment With the shaft 24 by means of the adjusting device previously described.

An oil well 48 '(Fig. 1') is formedin the housing 12 and contains oil for hrbricating the gears 20 and 22 and the shaft-2%. -.:A--

1'2 and its conducted to a passage 56 (Fig.

3) communicating with one end :of a ion tudinal oil groove 58 in the bearing 26 to lubricate the shaft Aupassagefiil at the opposite end the block municating with a passage 62 in the housing 12, drains off any surplus oil whichcolieets 1 in an annular recess 64 in (the end the block 26 and conducts it to the Well 18.

through the passage 74. Any oil tu t scouring wheels 18.

eachconnected one; end 86 to :1. in.

.issuianorted rod 90 (Figs. t which-is securedby a set sc ew 92 to a depending. flange 9410f the head 12. .96 on the conduit 8531s secured to 140. 1 COIH- fun of a. longitudinal 4-).is formed in each of the on. 0U for inh rating the shaft 16, and is supplied bv an oil cup- (Fig. 1}. A2! 21-5!- nnhir recess 72 4) is formed in each bushing: 66 adjacent-to the o1 end thereof Mid beyond the end of the (Hi. groove 62 to collect surplus oil, and a mssage "1'4. in each bushing 66, drains the surplus oil from each recess 72 and conducts it to the weil 48. A piurality of annular grooves 76 are. formed in the portions fthe shaft 16 which rotate within therece. e." 2 "the grooves 76 being adjacent to each other and thereby providing a series of sharp crests or ridge: between them. Most o f tlie surplus oil. which travels outwardly along th'esl' aft 16 will he whirled off the ridge betiveenthe inmost groove '76 "and the adjacent groove and wiii run down the wall of the recess 72 and drain out disposed of will ordinarily be wl the, second ridge and thelfoiowing; iith will serve totalteeare of any unusual sin-- plus of; iil. a thrust collar 78 is secured. to shaft 16 in position, to hear a v inst the outer ends respectively of the bushin s 66; and a grooveis formed on-cach of the col iars 7 .8 toprovide, a beveled edge 80 adgeeent to the outei ends respectively of the bus ings,66., In case any shght amount of o l should escape from the bushings66 it will be caught upon the beveled ed/ es 80 and 'u'hirled uponthenterior wall et an annular overhanging tiortion 82 formed on cash of the bushingsfiG, and Will thus be prevented .attering into the room.

,For coilecting thedust given off by the .Work during the scouring of the heels, a draft. conduit 84iisprovided for The condn j; iiainie screw Fur? Lei 1w bya. second .i.

s a for each conduit 84; is '=.n-'de(i 011d rod 100, which iii-st 1-4- by a set 'ew102. conduit 84 is secured second set screw 106.

The-conduits 84 are both alike. and

s: tion of one-.wil.lsuliire. end 86 of the conduit 84 1S substantdrical to conform to the usual shape of the receiving end of the main conduit 88. From its lower end 86 the conduit 84 (Fig. 2) extends forwardly and upwardly, with its axis inclined at substantially 45 to the horizontal and substantially tangent to the scouring wheel 18 at the forward portion of the periphery of the latter. The cross section of the conduit 84 gradually changes, upon approaching its upper end, from circular to rectangular form, the corners of the rectangle being well rounded.

A partition 108 divides the upper portion of the conduit 84 into a forward and a rearward passage 110 and 112, respectively. The upper end of the partition 108 extends in a plane substantially radial to the scouring wheel 18 and terminates as closely to the periphery of the wheel 18 as possible, allowing reasonable clearance. The lower end of the partition 108 extends in a plane substantially parallel to the above-mentioned axis of the conduit 84 and is so spaced as to provide a ratio of substantially 5 to 4 between the cross-sectional areas of the forward and rearward passages which it forms in the conduit 84. The intermediate portion of the partition 108 curves smoothly from the one to the other of the above-mentioned planes.

The forward upper portion of the conduit 84, now to be described, is so shaped as to enable the forward passage 110 to gather all of the dust whirled away from the wheel 18, while allowing full freedom of manipulation of a shoe S as the operator presents the heel of the shoe S to the wheel 18. The sides of the conduit 84 are therefore coned outwardly and upwardly (Figs. 1, 2, 5 and 6) to form lateral bulges 114 in the passage 110, the Vertices of the approximate (ones being truncated by the adjacent nnbulged portions of the sides of the con duit 84. The walls of the two bulged portions 114 terminate in edges 115 which lie in a plane perpendicular to the plane of the upper portion of the partition 108 and parallel to the axis of the wheel 18 and which intersects the upper portion of the partition 108 at a point close to the upper end thereof. The walls of the bulges 114 do not come together in front but the forward upper portion of each wall is flared outwardly and forwardly, curving smoothly into a wall 116 which is substantially flat. The two walls 116 together form a V-shaped trough, the vertex of which extends forwardly and downwardly, and the bottom of which is open, the bottom of this trough communicating with the passage 110 by a passage formed between a pair of flat walls 118. The walls 118 curve smoothly into the walls 116 respectively and into the forward wall of the conduit 84, diverging as they approach the forward wall of the conduit 84. The upper or inner end of the trough between the walls 116 communicates directly with the interior of the space within the bulges 114. The lower or outer end of this trough is closed by a wall 120 which also closes the bottom of the passage between the walls 1.18, the outer end portion of the wall 120 being flat and the inner end portion curving smoothly into the forward portion of the wall of the conduit 84 at a point above the lower end of the partition 108 and below the beginning of the bulged portions 114. The flat portion of the wall 120 slopes forwardly and downwardly at a small inclination to the horizontal. Each of the walls 116 of the trough has an upper or forward edge 122 which is continuous with one of the edges 115, but the edges 122 slope forwardly and downwardly at a much steeper angle than the edges 116. Because of the curvature between the walls 116 of the trough and the walls 118 of the passage with which the bottom of the trough communicates, the bottom of the trough is not clearly defined. It is represented, however, in Figs. 1 and 6 by the lines 124, which are lines of tangency seen by an observer looking hori- Zontally into the trough; and it is also represented by the shade lines 124 in Figs. 2 and 5. The entire conduit 84 is symmetrical with respect to the mid-plane of the wheel 18, and the above-described trough therefore may be described in the commonly employed term as lying in the plane of the wheel.

The walls of the passage 112 terminate at the upper end of the partition 108 and are flanged outwardly as at 126 (Fig. 2), the lower surface of the flange 126 lying substantially in the plane of the edges 115. A hood 128 partly encloses the rear portion of the wheel 18 and communicates .it its lower end with the passage 112. The hood 128 is pivoted at 130 to the flange 104 of the conduit 84, and is provided with an ex-- ternal flange 132 which rests upon the flange 126. The rear wall of the hood 128. as shown in Fig. 2 is approximately spiral with respect to the axis of the wheel 18, gradually approaching the periphery of the wheel 18 up to a point slightly forward of the topmost portion of the wheel 18, at which point it is spaced from the periphery of the wheel 18 only by a convenient clearance. The sides of the hood 128 partly cover the sides of the rear portion of the wheel 18, being spaced therefrom only bv a convenient clearance.

The hood 128 thus encloses the periphery and partly encloses the side walls of the wheel 18 over a large sector, substantially 180. of the wheel 18. The shape of the hood 128 as above described, conforms to the natural stream lines of the air passing through it, since no portion of the hood 128 extends cross-wise with respect to these stream lines, and since there are no rc-entrant or constricted portions or any sudden changes of direction in the hood 128 which might cause eddy currents or dead air spaces, or which might otherwise break up the natural stream lines. The hood 128 therefore provides a stream-line passage around the sector of the wheel 18 which it partially encloses. In the design of the con duit 84, all portions of the passage 112 are given a cross-sectional area at least as great as the area across the natural stream lines of the current of air flowing between the wheel 18 and any portion of the hood 128, so as not to choke the draft through the hood.

In operation, the switch 42 is turned on, starting the motor 30. The direction of rotation of the motor is such as to cause the wheels 18 to rotate in a clockwise direction as viewed in Fig. 2; that is, the forward portion of the periphery of each wheel 18 moves downward. As the edge of the heel of the shoe S is presented to the periphery of the scouring wheel 18, dust will be given off. It will be noted that the two bulged portions 114 of the passage 110 together with the upper portion of the partition 108 constitute a funnel-like structure having its large open end adjacent to the periphery of the wheel 18, and which will be hereafter termed a funnel, although the forward wall of this funnel is not closed but opens directly into the trough formed by the walls 116. Most of the above-mentioned dust consists of a cloud of minute particles and will be received directly into the funnel and then carried down the passage 110 by the draft in the conduits 88 and 84. Many of the larger particles of dust as well as some of the fine dust cloud above mentioned, will be projected downwardly at too steep an angle to enter the funnel, and this portion of the dust will be received in the trough between the sloping walls 116, and will be carried by the abtwe mentioned draft through the passage between the walls 118 and thence down the passage 110. The bulged portions 114 and the sloping walls 116 provide an open dust receiving end for the passage 110 of such size and shape as to gather in substantially all of the dust thrown away from the wheel 18. Because the coned walls of the portions 114 and the sloping walls 116 converge inwardly, they serve to accelerate the air current passing through them and thus to ensure that the entrained dust particles will be carried along by the current and will not settle upon any of the walls. Furthermore, the bo tom of the trough indicated by the lines 124, is so positioned that the shoe S may be mani 'iulated in any necessary manner without the walls 116 interfering with the toe portion of the shoe. The wall 120 which closes the lower forward end of the trough is inclined upwardly as it extends rearwardly in order to contract the area through which the air current passes, and thus to accelerate the current.

The wheel 18, because of its rapid rotation, will tend to set up a current of its own and carry a whirl of the lighter dust around with it. This tendency is overcome, however, by two features of the above-described dust collecting agencies. The first of these features is the partition 108, which extends radially of the wheel 18 as close as may be, allowing for reasonable clearance, to the periphery thereof, and thus directly cuts off most of the peripheral current and directs most of the dust entrained in the peripheral current into the funnel. consists of the hood 128, which is connected to the suction system through the passage 112; and since the partition 108 extends down the conduit 84 to a point below where the cross-sectional area of the conduit 84 begins to widen, the passage 112 will communicate the full intensity of the suction system to the hood 128 regardless of any widening in the cross-sectional area of the passage 110. The hood 128 will therefore maintain a counter current of air half way around the wheel 18; opposing any tendency of the wheel 18 to set up a circular current in the direction of its rotation. The spiral form of the hood 128 enables it to accommodate the volume of air drawn in through the clearance spaces between the walls of the hood and the sides of the wheel 18 and at the same time to maintain the full intensity of the suction all the way to the top forward end of the hood, so that even at that point the tendency of the wheel to create a peripheral current will be overcome and there will be a draft leading into the hood.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is:

1. In an abrading machine, an abrading wheel, and a dust collecting member having a portion in the form of a funnel having its large open end adjacent to the periphery of said wheel to receive dust from the work, another portion of said dust collecting member being in the form of an open-bot tomed V-shaped trough lying in the plane of said wheel and opening at one end into said funnel through the wall of said funnel to receive additional dust "from the work, the opposite end of said trough being closed and being below the level of the first-mentioned end, and the remaining portion of said dust collecting member being in the form of a conduit providing communication between the intake of a suction draft system and the small end of said funnel, said conduit also providing communication between the suction draft system and the bottom of said trough.

2. In a heel scouring machine, a scouring wheel, and a conduit comprising a draft pasi n The second feature a shoe as the shoe is manipulated to present the edge of the heel thereof to the periphery of said Wheel, one end of said trough opening into said funnel through the Wall of said funnel, a closure for the opposite end of said trough, and a passage connecting the bottom of said trough With the intermediate portion of said conduit.

HERBERT L. CHAPIN. 

